it takes a bit of time to put filters over website so it is normal to have that but I will see what I can do with it
and
androids do usually have a greyscale mode on the devices preinstalled, I can work around a bit to make it compatible with firefox android as well but I think an app is what you are looking for?
greyscaling particular apps right?
yes, definitely I am with you at that point, they are a great way to do this without a doubt
although
I am a windows user (lol) and also even if it's very fast to toggle the color filters via shortcut keys. I don't think so that I will be willing to toggle it off when I visit any work-related website like GitHub, Figma and such so site exclusion of this extension works really great for me in that perspective.